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the solution:
2
9
5
4
6
3
1
7
8
8
3
7
1
5
2
4
6
9
4
6
1
8
9
7
2
3
5
1
4
6
2
3
9
8
5
7
9
8
2
5
7
4
6
1
3
5
7
3
6
1
8
9
4
2
7
2
4
3
8
1
5
9
6
6
1
9
7
2
5
3
8
4
3
5
8
9
4
6
7
2
1